How Much Electricity Does a Fan Use? (Ceiling Fan or Box Fan)

Most household fans use 10 to 100 watts of electricity. A small desk fan draws around 10–25 watts, a tower fan 40–60, a box or pedestal fan 50–75, and a standard 48-inch ceiling fan about 75 watts on its highest speed.

At the U.S. average electricity rate of about 17 cents per kilowatt-hour (EIA, 2026), a 75-watt fan costs roughly 1.3 cents an hour to run or roughly $9 a month if it never turns off. To figure your own cost: watts ÷ 1,000 × hours running × your rate per kWh.

For comparison, a central air conditioner draws 3,000–5,000 watts. A fan uses about 2% of that, which is why running a fan and raising your thermostat a few degrees is one of the cheapest ways to stay comfortable.

Speed matters more than you might expect. A ceiling fan on low uses roughly a third of the power it uses on high, so the lowest setting that keeps you comfortable is the most efficient one.

Fans cool people, not rooms — they work by moving air across your skin. An empty room gets no benefit, so turn the fan off when you leave. The exceptions are extreme heat and winter, when running a ceiling fan clockwise on low pushes warm air down from the ceiling.

If you’re replacing an older fan, look for an Energy Star-certified energy-efficient model because they use about 60% less energy than conventional fans.

Are Ceiling Fans Cheaper Than Air Conditioning?

Yes. Ceiling fans are much cheaper to run than air conditioning. A standard ceiling fan uses about 75 watts, while a central air conditioner uses 2,000 to 5,000 watts, so a fan costs roughly a penny an hour to run versus about 23 cents an hour for central AC. Left on 24/7, a ceiling fan costs about $6.50 a month; central air running eight hours a day costs about $55 (based on a 2.5-ton unit at about 12¢/kWh).

But a fan can't replace your AC. An air conditioner cools the air; a fan only moves air across your skin, which makes you feel 3 to 4 degrees cooler without changing the temperature. On a 95-degree day, a fan alone won't keep your house comfortable.

What a fan can do is make your air conditioner work less. With a ceiling fan running, most people are comfortable with the thermostat set about 4°F higher, and each degree trims cooling costs by roughly 3%. That means pairing fans with your AC can cut your summer cooling bill by 10-15% for about $6 a month in fan electricity. On a $150 cooling bill, that's $15–$20 back every month. Just turn the fan off when you leave the room, since it's cooling you, not the room.

Box fans suck in air from one side and blow out cooler air from the other side. Many are stationary and provide direct, cool airflow, which means they work best when you point them at a couch, bed, workout equipment or workspace. However, they’re less effective at cooling down a large space. If you want to directly cool a specific area or feel more comfortable as you work, box fans are an excellent option for this purpose. They’re also a good choice in rooms that don’t have ceiling fans.

How Much Does It Cost to Run a Box Fan?

Depending on the model and size of your fan, it will use different amounts of power. The average 20-inch box fan uses about 75 watts per hour (.075 kWh) on full speed.

At around $0.01 per hour to operate, a box fan would cost you about $6.50 per month to power around the clock for a whole month here in Chattanooga, Tennessee. This makes box fans an energy-efficient choice to cool your home, since you can raise the temperature on your thermostat a few degrees without experiencing reduced comfort.

Like most home appliances, you can seek out energy-efficient models in order to minimize operation cost.

Are Box Fans Cheaper Than Air Conditioning?

Box fans are significantly cheaper than using air conditioning (AC). In Chattanooga, Tennessee, the average 20-inch box fan costs about $0.01 per hour to operate while a 2.5-ton central air conditioner with a Seer 16 rating costs about $0.23 per hour, depending on the square footage of your home. This means that even if you left a box fan running 24/7, it would cost about $6.50 per month to operate, compared to $162 per month to run your air conditioner 24/7.

Although box fans likely won’t be enough to keep your entire home comfortable during extremely hot weather, they can be used to supplement your AC, especially if you don’t have ceiling fans in your home. If placed strategically in your most used, warmest rooms, you might be able to keep your thermostat a few degrees higher, and keep your energy bill lower than if you were relying on AC alone.

Choosing the Right Way to Cool Your Home

Since every home is different and every person has different comfort levels, the type of fan that helps you save the most depends on your preferences. Consider the following when planning your fan-cooling strategy:

• Your local climate.
• Your home’s square footage.
• How many ceiling fans you have.
• Whether your family members are sensitive to warm or cool temperatures.
• How much white noise you can handle, as fans are often louder than AC and the sound could impact your family’s quality of life.

If you’re using fans to lower your energy bill, remember these tips to save as much energy as possible:

• Place your fans in your warmest rooms where you spend the most time, and turn them off when you leave.
• Use your fan at the lowest comfortable power setting.
• While the fans are running, set your thermostat to the highest temperature setting that you still find comfortable.
• In areas with hot summers, such as Chattanooga, Tennessee, fans may not provide enough cooling to keep you comfortable, but they can be used alongside AC so that you don’t have to run your HVAC as much.
• Ceiling fans provide cool air to a wider area. Use ceiling fans in larger rooms or spaces and turn them off when you leave the room.
• Box fans provide direct cooling to a small area. Use them to cool down a small room or a specific space.
• If your box fan has an oscillating option, you can use it to cool down larger spaces.
• Watch this quick video on how to reverse your ceiling fans seasonally to save even more.

Use the tips above to create your home’s energy-efficiency cooling strategy. That way, you save more on your energy costs while staying safe and comfortable.

Want to learn more about how you can optimize your usage to reduce your bill? Your EPB Energy ProsSM are here to help EPB customers at no cost. Schedule a free, 30-minute EPB Home Energy CheckupSM or a 30-minute phone consultation. Learn more at epb.com/energypros.

Remember that there is no reason to install a dimmer switch if you just want to turn the lights off instead of lowering the brightness. In that case, you can skip buying a dimmer switch.

Always check which light bulbs work with dimmer switches to make sure the bulbs you have installed are compatible with a dimmer switch.

Most new lightbulbs will be able to be used in this way, but that is not true of every single style of lighting or some LED bulbs. Installing dimmer switches is a simple way to help save on power, but you should not install these switches if you are not using the right bulbs for this style of switch.